Sh4mefulDMARC Spoof Detection, Confounders
Legitimate services whose forwarding or inspection behavior disrupts DMARC authentication.
Confounder Networks
Top 28 by failure volume| Network | Owner | Unique IPs | Messages |
|---|---|---|---|
| AT-88-Z ⚠ | Amazon | 26 | 46,184 |
| UK-MICROSOFT-20060601 ⚠ | Microsoft | 1,015 | 13,343 |
| MSFT ⚠ | Microsoft | 3,321 | 13,169 |
| AMAZON-2011L ⚠ | Amazon | 1 | 2,358 |
| GOOGLE ⚠ | 1 | 1,226 | |
| AMAZO-4 ⚠ | Amazon | 6 | 884 |
| PROOFPOINT-NET-NORTH-AMERICA ⚠ | Proofpoint | 81 | 495 |
| MNA-95 ⚠ | Mimecast | 25 | 292 |
| CISL-7 ⚠ | Cisco | 14 | 184 |
| EONIX ⚠ | Eonix/Scamalytics | 1 | 128 |
| PROOF ⚠ | Proofpoint | 27 | 116 |
| AMAZON ⚠ | Amazon | 1 | 79 |
| MICROSOFT-IPV6-BLK ⚠ | Microsoft | 53 | 74 |
| BARRA-7 ⚠ | Barracuda | 30 | 70 |
| INTRMD-1 ⚠ | Intermedia | 1 | 69 |
| MIMECAST-NET2 ⚠ | Mimecast | 1 | 59 |
| MIMECAST-NET ⚠ | Mimecast | 2 | 54 |
| ZIXCORP ⚠ | OpenText | 4 | 36 |
| IRONPORT-DH ⚠ | Cisco | 8 | 32 |
| UK-PROOFPOINT-20151223 ⚠ | Proofpoint | 3 | 24 |
| NAVI-207-211 ⚠ | 5 | 24 | |
| pfptnl ⚠ | Proofpoint | 2 | 22 |
| RN-52 ⚠ | 14 | 22 | |
| PAUBOX-01 ⚠ | 6 | 17 | |
| UK-MIMECAST-NET3 ⚠ | 3 | 9 | |
| UK-MIMECAST-NET1 ⚠ | 2 | 6 | |
| MIMECAST-AU ⚠ | Mimecast | 2 | 3 |
| UK-MIMECAST-NET2 ⚠ | 1 | 2 |